Okay, so the title is corny, it got you in here

Undertandin' F-Stops and Exposure


I got a funny notion (PM) that somebody might find this stuff useful

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Understanding Exposure @ luminous-landscape.com

Understanding Depth-of-field @ apogeephoto.com

A Tedious Explanation of the f/stop @ uscoles.com

F-number @ wikipedia.org

Plumbing @ photoimagenews.com

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ŻŻŻŻŻ””/(”ŻŻŻŻŻŻŻŻ””/(”ŻŻŻŻŻŻŻ Ż””/(”ŻŻŻŻŻŻŻŻ

the f-numbers are logarithmic, but they are easy to remember. Each f-stop doubles or halves the amount of light passing through the lens depending on whether you're increasing or decreasing. We all know that the larger number represents a smaller opening, hence f/8 will allow less light than f/4, for example.

Starting at a lens with a maximum aperture of f/2.0 as an example, the next full f/stop smaller would be f 2.8, or roughly 1.4 times the maximum aperture numerically. Two full f/stops would be f 4.

The progression actually goes as follows:

f/1
f/1.4
f2
f2.8
f4
f5.6
f8
f11
f16
f22
f32

Each full f/stop allows 1/2 the light

Most modern digital cameras can break down f/stops into halves and thirds, so you'll see all manner of strange numbers when you're shooting in Tv mode, and even Av mode.

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ŻŻŻŻŻ””/(”ŻŻŻŻŻŻŻŻ””/(”ŻŻŻŻŻŻŻ Ż””/(”ŻŻŻŻŻŻŻŻ




(*sets internal apertures to the equivalent of F188*) .. (*sets internal shutter speed to 8 hrs*) .. (*ZZZzzzzzZZZ*)

I appreciate it Keith, you are the man.

Finally had time to check out "A Tedious Explanation of the f/stop"!!

~drools and looks bewildered~

Pops an aspirin and simply rotates camera mode back to AUTO!! Know one will ever know!! Shhhh...